Characterization and calibration of a CCD detector for light engineering

Fiorentin, P.; Iacomussi, Paola; Martignon, A.; Rossi, G.

doi:10.1109/imtc.2003.1207921

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…This value seems very high according to luminance levels (often lower than 2 cd/m 2 on the road). However, it integrates both the error due to the measuring instrument itself (AE5%) 28 and the impact of the environmental conditions 29 (climatic conditions, road surface, extra light, etc.). Economic analysis.…”

Section: Evaluation Protocolmentioning

confidence: 99%

Evaluation of the performance of an optimized road surface/lighting combination

Muzet

Greffier

Nicolaï³

et al. 2018

Lighting Research & Technology

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Taking into account the actual photometric characteristics of a road surface to design and then adjust a lighting installation is seldom done. In a lighting renovation, one of the Commission Internationale de l'Eclairage's standard r-tables is arbitrarily chosen although they are no longer representative of the characteristics of current road surfaces. The objective of the study is to assess an optimized, evolutive pavement and lighting combination, called Lumiroute®. To do this, two conventional designed sections were compared with two Lumiroute® sections. On-site measurements of road photometry, luminance and power consumption were conducted at regular intervals for three years. This paper presents the results of the photometric study together with an economic analysis. The Lumiroute® sections offer optimized performance and increased efficiency in comparison with the ordinary sections, particularly with regard to light and energy performance.

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Section: Evaluation Protocolmentioning

confidence: 99%

Evaluation of the performance of an optimized road surface/lighting combination

Muzet

Greffier

Nicolaï³

et al. 2018

Lighting Research & Technology

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“…The use of calibrated cameras 9 to measure luminance must be consistent with the definition of luminance as detailed in the International Standard ISO-23539, which determines the characteristics that any luminance meter must meet. It is common to find in the literature papers detailing CCD or CMOS cameras systems for the measurement of luminance.…”

Section: State Of the Artmentioning

confidence: 99%

“…With the optical system and the camera intrinsic parameters fixed, a linear regression has been made to obtain a linear transformation from gray levels to luminance for different camera apertures 9 (Figure 5). Several apertures must be taken into account to extend the luminance measurement range.…”

Section: Luminance Measurement Rangementioning

confidence: 99%

Dynamic measurement of traffic signluminance as perceived by a driver

Gutierrez

Lejarazu

Real

et al. 2011

Lighting Research & Technology

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Most of the information received by a driver is provided by road signs and markings, especially in low visibility conditions and at night. While road markings mainly show the boundaries of the road, traffic signs inform, indicate, forbid, oblige, orientate and warn of risks and dangers. This paper describes a method for dynamically measuring traffic sign luminance as perceived by the driver of a typical European car on an empty and unlit road, without causing discomfort to other drivers on the road.

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“…However, the reflectivity, which is defined as the luminance divided by the luminous energy flow impinging on a surface element (i.e., illuminance), is a parameter which is more closely related to the surface deterioration, but it is still influenced by the relative orientation between the light source, the sign, and the camera. An example of the complexity of the involved geometry can be seen in [6], where a study of the reflection properties of road surfaces is presented. To overcome this last influence of the relative orientation and to find a parameter which almost only depends on the surface deterioration of the sign, we need to know how the surface reflects the light, or alternatively, we need to establish a specific relative orientation between light source-sign-camera.…”

Section: Introductionmentioning

confidence: 99%

“…The CCD sensor has a linear response [2]- [4], [6], whereas the CMOS photodetector that we used exhibited a nonlinear response to the amount of luminous energy impinging on it. The principal advantage of using the CMOS photodetector is that there will be no blooming effect so that the saturated pixels will not affect their neighbors.…”

Section: Introductionmentioning

confidence: 99%

Fundaments in Luminance and Retroreflectivity Measurements of Vertical Traffic Signs Using a Color Digital Camera

Siegmann

López-Sastre

Gil-Jiménez

et al. 2008

IEEE Trans. Instrum. Meas.

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Abstract-This paper is a study of the influences of the different parameters which affect the photometric evaluation of light-emitting surfaces (due to reflection or self-emission) when a conventional color digital camera is used. The overall purpose of this paper is to evaluate the luminance and the reflectivity of the vertical traffic sign with the camera in order to provide an automatic recognition of deteriorated reflective sheeting material of which the traffic signs were made. This paper describes how the A/D converter output signal given by a pixel of the digital camera can be related to the luminance and the reflectivity of the corresponding surface element whose image is formed on a pixel. Thus, each surface element of the traffic sign's surface can be separately evaluated. By photometrically calibrating the camera, we have been able to prove this relationship in our experiments.

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Characterization and calibration of a CCD detector for light engineering

Cited by 10 publications

References 3 publications

Evaluation of the performance of an optimized road surface/lighting combination

Evaluation of the performance of an optimized road surface/lighting combination

Dynamic measurement of traffic signluminance as perceived by a driver

Fundaments in Luminance and Retroreflectivity Measurements of Vertical Traffic Signs Using a Color Digital Camera

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